using System.Text;
using BlueWest.Cryptography;
using CodeLiturgy.Data.Application.Users;
using CodeLiturgy.Data.Auth;
using CodeLiturgy.Data.Auth.Context.Users;
using CodeLiturgy.Domain;
using BlueWest.WebApi.Context.Users;
using CodeLiturgy.Views.Utils;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;

namespace CodeLiturgy.Views;

public static class StartupExtensions
{
    /*
    private static MySqlServerVersion GetMySqlServerVersion(int major, int minor, int build) =>
        new(new Version(major, minor, build));
        */

    private static string GetDbConnectionString(this IConfiguration configurationRoot, string key)
    {
        var startupMode = configurationRoot["mode"];

        if (!string.IsNullOrEmpty(startupMode))
        {
            var config = configurationRoot.GetSection($"ConnectionString:{startupMode}")[key];
            return config;
        }
        return String.Empty;

    }



    internal static IServiceCollection AddAuthServerServices(this IServiceCollection services,
        IConfiguration configuration, IWebHostEnvironment environment)
    {
        services.AddSession(options =>
        {
            options.Cookie.Domain = SessionConstants.CookieDomain;
            options.Cookie.HttpOnly = true;
            options.IdleTimeout = TimeSpan.FromHours(8);
        });

        services
            .AddScoped<IJwtTokenHandler, JwtTokenHandler>()
            .AddScoped<IJwtFactory, JwtFactory>()
            .AddScoped<UserRepository>()
            .AddScoped<IUserManager, ApplicationUserManager>()
            .AddScoped<IAuthManager, AuthManager>()
            .AddScoped<IHasher, Hasher>();

        // Database Context and Swagger


        // Register the ConfigurationBuilder instance of AuthSettings
        var authSettings = configuration.GetSection(nameof(AuthSettings));
        services.Configure<AuthSettings>(authSettings);
        var signingKey = new SymmetricSecurityKey
            (Encoding.ASCII.GetBytes(authSettings[nameof(AuthSettings.SecretKey)]));

        // jwt wire up
        // Get options from app settings
        var jwtAppSettingOptions = configuration
            .GetSection(nameof(JwtIssuerOptions));

        // Configure JwtIssuerOptions
        services.Configure<JwtIssuerOptions>(options =>
        {
            options.Issuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)];
            options.Audience = jwtAppSettingOptions[nameof(JwtIssuerOptions.Audience)];
            options.SigningCredentials = new SigningCredentials
                (signingKey, SecurityAlgorithms.HmacSha256);
        });

        var tokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidIssuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)],

            ValidateAudience = true,
            ValidAudience = jwtAppSettingOptions[nameof(JwtIssuerOptions.Audience)],

            ValidateIssuerSigningKey = true,
            IssuerSigningKey = signingKey,

            RequireExpirationTime = false,
            ValidateLifetime = true,
            ClockSkew = TimeSpan.Zero
        };

        services.AddAuthentication(options =>
            {
                options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
            })
            .AddCookie(options =>
            {
                options.LoginPath = Routes.AuthLoginRoute;
                options.LogoutPath = Routes.AuthLogoutRoute;
            })
            .AddJwtBearer(configureOptions =>
            {
                configureOptions.ClaimsIssuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)];
                configureOptions.TokenValidationParameters = tokenValidationParameters;
                configureOptions.SaveToken = true;
                configureOptions.Events = new JwtBearerEvents
                {
                    OnAuthenticationFailed = context =>
                    {
                        if (context.Exception.GetType() == typeof(SecurityTokenExpiredException))
                        {
                            context.Response.Headers.Add("Token-Expired", "true");
                        }

                        return Task.CompletedTask;
                    },
                };
            });


        // api user claim policy
        services.AddAuthorization(options =>
        {
            options.AddPolicy(SessionConstants.ApiNamePolicy,
                policy => policy.RequireClaim(Constants.JwtClaimIdentifiers.Rol,
                    Constants.JwtClaims.ApiAccess));
            options.AddPolicy(SessionConstants.CookieNamePolicy, policy =>
            {
                policy.RequireClaim(Constants.CookieClaims.CookieAccess);
            });
        });

        // add identity
        var identityBuilder = services.AddIdentityCore<ApplicationUser>(o =>
            {
                o.User.RequireUniqueEmail = true;

                // configure identity options
                o.Password.RequireDigit = false;
                o.Password.RequireLowercase = false;
                o.Password.RequireUppercase = false;
                o.Password.RequireNonAlphanumeric = false;
                o.Password.RequiredLength = 6;
            })
            .AddUserManager<ApplicationUserManager>()
            .AddUserStore<UserRepository>();

        identityBuilder =
            new IdentityBuilder(identityBuilder.UserType, typeof(ApplicationRole), identityBuilder.Services);
        identityBuilder
            .AddEntityFrameworkStores<ApplicationUserDbContext>()
            .AddDefaultTokenProviders();

        return services;
    }


    private static DbContextOptionsBuilder UsePsqlConfiguration(this DbContextOptionsBuilder builder, IConfiguration configuration)
    {
        var connString = configuration.GetDbConnectionString("db");
        builder.UseNpgsql(connString);
        return builder;
    }

    
    /// <summary>
    /// Setup database Contexts
    /// </summary>
    /// <param name="serviceCollection"></param>
    /// <param name="configuration"></param>
    /// <param name="environment"></param>
    /// <returns></returns>
    public static IServiceCollection PreparePostgresqlDatabasePool(this IServiceCollection serviceCollection,
        IConfiguration configuration, IWebHostEnvironment environment)
    {
        return serviceCollection
        .AddDbContextPool<SiteDbContext>(options => options.UsePsqlConfiguration(configuration))
        .AddDbContextPool<ApplicationUserDbContext>(options =>
            options.UsePsqlConfiguration(configuration));
    }
    
    
}